Farad caps and a box

  Hey, I'm curious what you guys think about farad caps. I heard people say good and bad things about them. If I use big enough capaciters will I still need an altenator upgrade or a second battery.

Second at some point soon I am going to build my box. It's for 4 tens going into an 87 golf gti. I already took the seats out but there is an anti roll bar in the trunk area. I am actually wondering which way they face. I've thought about three setups assuming they should be firing towards the rear. It's going to be a sealed box and one thought was to make a platform that I can put an amp rack long ways in the middle with 2 subs on each side firing up and towrds the center of the roof. Second is to put 2 subs in a row firing towards the rear with a slight angle up with the amp rack closer to the seat and last trying to fit all four in row with the amps near the seats again.

Alright, alternator upgrade it is. Any ideas on which way the speakers should face.Thanks